fix TypeError when using submit_tag with Symbol value

Fix typo on documentation

Plugin Usage and Installation instructions

Didn't like the constant being at the top of the file, gave it overdue importance.

Now that `color_output` expects a result we can shorten some of the flexibility
from earlier:

  * Inline COLOR_CODES constant (keep local variable for readability,
    but don't need names of colors at run time).
  * Inline color variable in `color_output`. Looks just as clear without it.

Focus `color_output`'s intent on coloring output by a result. We aren't meant
to pass it arbitrary codes to color output.

The word color is being thrown all around with slightly different meanings.

Right now, I understand it. But I'd like to be more immediately clear.

I got the blues because we aren't coloring any lines blue.

The static red color wouldn't paint skips in their designated yellow.

Use the color name we got from the result label earlier, which marks
skips as yellow.

I should have replaced the summary reporter with a subclass
the first time I wrote this.

For whatever reason, I didn't. Do it right and slim the methods added
to Minitest in the process.

Minitest by default includes a summary reporter and a progress reporter.

To print colored output, we have to replace the progress reporter.

Add colored output to the new test reporter.

Improve readability of CacheHelper section

[ci skip]

release notes, use past tense. [ci skip]

Fixes LoggerSilence#silence threadsafety

Add i18n caveat to number_to_currency docs [ci skip]

I've worked on a few applications that have gone through the
internationalization process and had issues because they were using
`number_to_currency`. The minute a user is allowed to change their
locale, they can change the price displayed on a page from 10 US dollars
to 10 Mexican Pesos, which is far from the same amount of money.

Unlike other helpers that rely on i18n, `number_to_currency` does not
produce equivalent results when the locale is changed.

As I've explained this to a few groups of developers now, I thought it
might make for a good caveat in the docs.

- uses instance defined level if no custom local log level defined
- Keeps track of local log level per [ thread + object-instance ]
- prevents memory leakage by removing local level hash key/value on #silence method exit
- avoids the use of Thread local variables

[ci skip]

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Fix typos in Rails 5.0 release notes [ci skip]

Fix Regression in Numericality Validations

Fix letter case and grammar in Routing guide

A regression (#22744) introduced in 7500daec caused certain numericality
validations to raise an error when run against an attribute with a
string value. Previously, these validations would successfully run
against string values because the value was cast to a numeric class.

This commit resolves the regression by converting string values to
floats before performing numericality comparison validations.

[fixes #22744]

Covers Regressions:

* <=
* <
* ==
* >
* >=
* other than

`join_to_delete` is same as `join_to_update`

Add #== back to ActionDispatch::MiddlewareStack::Middleware